I'm having trouble finding out how to solve this integral.
I know the correct answer is: 0.235619, but I want to know if my work is correct. So far, whenever I work it out, I don't get the right answer.
From the integral,
((1/2)(1-cos10x))^2
= (1/4) integral (1-cos10x)^2
=(1/4) integral (1-2cos10x * (cos10x)^2
=(1/4) integral 1-2cos10x * ((1/2)1+cos20x)
From there, I plugged in the numbers, but I'm not getting the correct answer. Help?